Linking to the 14.2 list (https://support.apple.com/en-us/HT211929) might be better? After clicking the headline link, it took me a few seconds to understand why we were caring about updates for the iPhone 5 and 6...
Well, yes, its better than your average Android vendor. But on the other hand Windows 8 was released 2012 (i.e. about a year before iPhone 5s), and is scheduled to get updates until 2023. That is pretty serious longevity. And supporting handful of Apple devices must be comparatively simpler than supporting the hodgepodge fleet of Windows 8 devices.
8.1 on the other hand _is_ supported until 2023. [2]
The majority of 8.0 users immediately upgraded to 8.1 (because 8.0 was slightly terrible), so you're mostly correct. 10 years of support is pretty standard for Windows releases.
[1] https://docs.microsoft.com/en-ca/lifecycle/products/windows-...
[2] https://docs.microsoft.com/en-ca/lifecycle/products/windows-...